Mascara brush



FIG. 1 is a perspective view of the mascara brush;

FIG. 2 is a front elevational view of the mascara brush shown in FIG. 1;

FIG. 3 is a rear elevational view of the mascara brush shown in FIG. 1;

FIG. 4 is a left-side elevational view of the mascara brush shown in FIG. 1;

FIG. 5 is a right-side elevational view of the mascara brush shown in FIG. 1;

FIG. 6 is a top plan view of the mascara brush shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the mascara brush shown in FIG. 1.

Any portions shown in dashed or broken lines form no part of the claimed design. 

CLAIM The ornamental design for a mascara brush, as shown and described. 